Cylinder relief-valve.



No. 741,828., PATENTED OCT; 20, 1903.

- 0. L. PRESNELL.

CYLINDER RELIEF VALVE.

APPLICATION FILED JUN}: 27. 1903.

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PATENTED 001?. 20, 1903.

C. L. PRESNELL. CYLINDER RELIEF VALVE. APPLIGATION FILED JUNE 27, 1903.Q

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NITED STATES Patented October 20, 1903.

FFICE.

CYLINDER RELIEF-VALVE.

.EPECIFICATION forming part of Letters Application filed June 27,1903

To all whmn it may concern.-

Be it known that I, CHARLES L. PRESNELL, a citizen of the United States,residing at Mountairy, in the county of Surry and State of NorthCarolina, have invented a new and useful Cylinder Relief-Valve, of whichthe following is a specification.

My invention relates to a cylinder reliefvalve; and the object of myinvention is to provide a valve of this character which willautomatically open on excessive pressure due to water in an engine orpump cylinder by reason of condensation of steam in the cylinder orfeed-pipe or by reason of water having been carried to the cylinder fromthe boiler while steam is being drawn therefrom.

A still further object of my invention is to provide a valve which willautomatically open and drain a cylinder when steam is cut from thecylinder, thereby avoiding danger from water collecting in the cylinderthrough a leaky throttle-valve, for example, and freezing.

' Myinvention consists in the novel features of construction andcombination of parts hereinafter fully described, particularly pointedout in the claims, and shown in the accompanying drawings, in which-Figure 1 is a side elevation showing my valve applied to anengine-cylinder. Fig. 2 is a vertical section taken centrally andlongitudinally through the valve-casing. Fig. 3 is a sectional viewtaken vertically through the center of the valve ata right angle to Fig.2. Fig. 4 is a perspective view of a sleeve forming one of thevalve-seats. Fig. 5 is a section on the line 5 5 of Fig. 3. Fig. 6 is asection on the line 6 6 of Fig. 2.

In constructing my valve I employ an elongated valve-casing A, of brassor any other suitable metal. The casing is open at each end,the endportions being interiorly threaded, and into these ends are fitted pipesB B, the pipe B leading from the lower head end of a cylinder and thepipe B leading from the lower side of the crank end. A socket is formedon the upper side of the casing, and over this socket is securedadownwardlyopen dome 0, divided adjacent its upper end by a partition 0into upper and lower compartments, the upper compartment being closed bya removable cap 0 The casing A Patent No. 741,828, dated October 20,1903. Serial No. 163,416. (No model.)

is divided into three chambers by the obliquely-arranged divisional wallA, whereby are formed two outer chambers, which are practicallycontinuations of the pipes B B, respectively, and a lower intermediatechamber below the dome C. The walls A have openings D formed in them,and a valve-seat is formed on the under side of the walls around theopenings. Plugs D are threaded into the lower wall of the casing, andsockets D are formed in these plugs in alinement with the openings D. Acheck-valve D cooperates with each seat, the stem D of the valve slidingin the socket D andthe valve opening by gravity. Between the plugs D anopening is formed in the bottom of the easing and is surrounded by anannular depending interiorly-threaded flange E, and into this "flange isthreaded the upper portion of a depending sleeve E, the lower end of theflange resting against a shoulder E formed in the sleeve. The upperinner end of the sleeve has a notched or serrated edge,as shown at E inFig. 4. A valve-seat E is formed in the sleeve adjacent its upper end. Avalve F rests on said seat and hasadepending stem F. Aweb F is formed inthe sleeve below the seat, and working in the central threadedperforation of the web is a tension-nut F The valve-stem F extendsloosely through the nut F. A coiled spring F encircles the stem, bearingat its up per end on the valve F and at its lower end against the innerend of the nut F The tendency of this spring is to lift the valve F fromits seat. An opening G adords communication between the intermediatechamber and the lower portion of the dome, the opening being normallyclosed by a valve H. In the partition 0 is arranged a threadedperforated nut'IP, and the valve-stem H slides through same. A spring Hencircles the stem and bears downward on the valve H and upward on awasher H which is held in position by the nut H By adjusting the nut thetension of the spring H can be regulated. An exhaust-pipe I leads fromone side of the dome, and a drip-pipe J is connected to the lower end ofthe sleeve E.

The operation of my device is as follows: On opening the throttle-valveto admit steam to the head end of the cylinder forward movement of thepiston will force any water that also closing the valve D on the side ofthe casing adjacent the pipe B. On the return movement of the pistonwater will be forced from the cylinder through the pipe B, the valve Don the pipe B side closing. The valve H is set by the spring H for theworking pressure, and should this pressure be exceeded will lift,allowing the water to escape through the dome and pipe I. When steam isshut off and pressure is removed, the valves D fall by gravity, leavingthe opening D uncovered, and the valve F is lifted by the spring belowit, and any water collecting in the cylinder can drain out.

It is obvious that no valves will have to be operated by hand to clearthe cylinder of Water.

Having thus fully described my invention, What Iclaim as new, and desireto secure by Letters Patent, is

1. The combination With a cylinder, of a valve-casing-havingcommunication with each end of the cylinder, oppositely-actingcheckvalves arranged in said casing, a spring-actuated drip-valve in thelower part of the casing, a safety-valve in said casing, and means forregulating the pressure required to lift the last-mentioned valve.

2. The combination with a cylinder, of a valve-casing having end andintermediate chambers and a dome, pipes connecting the end chambers withthe ends of the cylinder, check valves arranged between each end chamberand the intermediate chamber, said valves opening by gravity and closingby reason of pressure in the intermediate chambers, a valve in saidintermediate chamber adapted to be closed by pressure within thecylinder, a spring adapted to lift said valve when steam is cutoff fromthe cylinder, and a relief-valve arranged in the dome and adapted topermit escape of steam and water from the intermediate chamber at apredetermined'pressure.

3. A device of the kind described comprising a casing arranged beneath acylinder, said casing having end and intermediate chambers, pipesconnecting the end chambers with 50 the ends of the cylinder,check-valves adapted to open automatically when steam is cut off fromthe cylinder, a valve arranged in the intermediate chamber, and a springadapted to lift said valve when pressure of steam in the intermediatechamber falls below a predetermined point.

CHAS. L. PRESNELL.

Witnesses:

O. R. MERRITT, E. H. KOOHLITZKY.

